I bite my nails too but not as badly as I did before therapy :-) and now I often have "regular" nails. One thing I was "playing" with 5-7 years ago was was I'd bite my nails and the next day I'd have an allergic rash and/or hives and it would be good that I didn't have nails. I started thinking maybe my body knew/sensed more of what was going on with me and "felt" a buildup of whatever caused the rash/hives so "encouraged" :-) me to bite my nails.